NEW INTERPRETATION OF CNIDARIA 



235 



development which has been called a strobilation and which 

 can thus be considered as a secondary phenomenon. In the 

 blindly ending trend of the Lucernariidea, the monodiscal 

 strobilation without a separation has appeared as a con- 

 sequence of a regressive evolution. 



Fig. 43. Two species of scyphopolyps with peridermal thecae, 



A, Nausiihoe sp. (from Komai). B, ^^Tubularia striata" Vanhoffen 



a solitary scyphopolyp of unknown systematic position; (after 



Vanhoffen). 



In this way Cubomedusae, or rather Carybdeidea, come into 

 the first place; they should be followed by Lucernariidea 

 (they have also been called, less fortunately, Stauromedusae). 

 The further sequence can remain the same as it now usually 

 appears in these classifications, i.e., Coronata, Semaeostomata, 

 and Rhizostomae. The polyp generation of the Coronata show 

 a few signs of primitivism as has already been mentioned 



